estudio y caracterización de un plasma de microondas a presión ...
estudio y caracterización de un plasma de microondas a presión ...
estudio y caracterización de un plasma de microondas a presión ...
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Figure 5.12: CN rotational bands observed in the discharge of the <strong>plasma</strong>.<br />
5.4. Conclusions<br />
Capítulo 5<br />
The air <strong>plasma</strong> used in this study was proven to be effective at <strong>de</strong>composing CCl4<br />
and C2HCl3. The <strong>de</strong>struction efficiency of the <strong>plasma</strong> increased with an increase in<br />
applied microwave power; however, at 300 W, <strong>de</strong>struction percentages of 99.99% were<br />
achieved. An optimum range of flow rates were observed for each diameter of the<br />
coupler tip, and the corresponding gas velocity was ca. 48 m/s. The range of optimal<br />
flow rates and the ability to replace the tip allowed the efficiency of the process to reach<br />
1000 g/kW·h at an operating cost of approximately $0.1/kg of VOCs. Moreover, the<br />
percent <strong>de</strong>struction of the proposed system increased with an increase in the input<br />
concentration of VOCs, which is consistent with previous results.<br />
The <strong>plasma</strong> torch investigated in this study can be used in industrial settings for<br />
the removal of VOCs because it can be operated with an air <strong>plasma</strong> at atmospheric<br />
pressure and the cost of operation is low. Moreover, the range of treatable VOC<br />
concentrations is virtually <strong>un</strong>restricted, which is a significant advantage to the proposed<br />
method.<br />
Intensity (a.u.)<br />
20000<br />
18000<br />
16000<br />
14000<br />
12000<br />
10000<br />
8000<br />
6000<br />
4000<br />
2000<br />
CN Rotational Bands<br />
Air <strong>plasma</strong><br />
Flow rate: 1.5 L/min<br />
MW power: 600 W<br />
1000 ppmv C 2 HCl 3<br />
0<br />
384 385 386 387 388 389<br />
Wavelength (nm)<br />
139